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    <title>Document</title>
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    <script>
        //默认发返回一个fulfillled实例,且值是传进去的实参,快速包装一个promise实例
        const p1 = Promise.resolve(1)
        console.log('p1',p1);

        const p2 = Promise.resolve(new Promise((resolve,reject)=>{
            // resolve('成功')
            reject('erro')
        }))
        //如果实参是一个promise实例,则返回值和状态和这个promise实例保持一致
        console.log('p2',p2);
    </script>
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